What is the difference between order and molecularity of a reaction?

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Solution

Molecularity	Order of a reaction
1. It is the total number of molecules of the reactants taking part in a single step of the reaction.	1. It is the sum of the indices to which the concentration terms are raised in rate equation, for the reaction.
2. It is always a whole number.	2. It may be a whole number, a fraction or zero.
3. It is obtained from the simple balanced chemical equation.	3. It is obtained through experimentation and is dependent upon the rate for the overall reactions.
4.It is theoretical concept.	4. It is experimental quantity.

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